Authentication bypass via early EAP-Success message in strongSwan
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-45079 |
| CWE-ID | CWE-371 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
strongSwan Server applications / Encryption software |
| Vendor | strongswan.org |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) State Issues
EUVDB-ID: #VU59994
Risk: High
CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-45079
CWE-ID:
CWE-371 - State Issues
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper handling of EAP-Success messages. A remote attacker can send a specially crafted (early) EAP-Success message to the affected system and bypass authentication or perform a denial of service attack.
Install updates from vendor's website.
Vulnerable software versionsstrongSwan: 4.1.2 - 5.9.4
External linkshttp://www.strongswan.org/blog/2022/01/24/strongswan-vulnerability-(cve-2021-45079).html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
